Used Mercedes-Benz Headlight Relays

All used Mercedes-Benz Headlight Relays listed on are tested, original (OEM) manufacturer parts and come with a 14 day money back guarantee. list used car parts for Mercedes-Benz are from premium breaker yards from across the UK, saving you up to 80% compared to main dealer prices.

About Headlight Relays

The Mercedes-Benz headlight relay is a remote electrically operated switch and is used in some vehicles wiring to minimise the voltage loss from the battery to the headlights. In basic headlight wiring systems, the power will travel from the battery to the alternator, to the headlight switch and then finally to the headlights. However, when a model> headlight relay is fitted, the voltage goes from the battery to the relay and then directly to the headlights. Because the power has a shorter distance to go, the voltage loss is much smaller meaning that the headlights perform better and put out more light. It’s also possible to successfully add higher output bulbs without overloading your headlight wiring.

The Mercedes-Benz headlight relay is also used to protect the switch from overheating from high amperage. Many headlight wiring systems use two relays to control the flow of power successfully, one for high beam wiring and one for the low beam wiring.

Relays can fail because of oxidisation, overheating or due to a faulty connection in the relay socket. If the Mercedes-Benz headlight relay shows signs of failure your headlights may become dim, which can eventually lead to headlight failure.

Mercedes-Benz trivia

  • That new car smell is always a delight, but a Mercedes owner gets to choose that smell. Perfume specialist Marc vom Ende created four different car smells for Mercedes Benz, called Sports Mood, Freeside Mood, Downtown Mood, and Nightlife Mood. They all smell a bit leathery.
  • Karl Benz founded the famous car company. He is not only credited as the maker of the world's first practical motorcar but also has the distinction of being the first person ever issued with a driving license (local citizens kept complaining about the noise and smell of his Motorwagen, and so he needed written permission to drive it).
  • The longest sedan vehicle available in today's car market is the S-Class Pullman, at a mind-boggling 6.5 metres long. Bear in mind that the average length of a sedan is only 4.7 metres!
  • Mercedes are responsible for a lot of 'firsts' in their long history, including the world's first production of a diesel car. Very impressive, but it only had three wheels. Production stopped pretty quickly in the late 1950s.
  • The Popemobile is a Mercedes Benz M-Class SUV. It's not a standard model, however, and has some added features like an inbuilt oxygen system and bulletproof glass.